Ventilating system



March 25, 1930.

w. L. FLEISHER VENTILATING SYSTEM Filed Feb s, 1928 INV ENTOR. 4mm, x. 9m

ATTORNEYS.

Patented Mar. 25, 1930 UNI-TED. STATES PATENT OFFICE.

WALTER I. FLEISHER, OF NEW YORK, N. Y., ASSIGNOR TO THE COOLING &; AIR GON- DITIONING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK 'vnN'rILA'rING svs'rnm:

Application filed February 8, 1928. Serial No. 252,759. I

This invention relates to ventilation, more particularly to Ventilation of public enclosures intended for human occupation. The invention is particularly applicable to pub- 5 lic auditoriums such as theaters and will-be particularly described in connection with such an installation although obviously many features of it will be of wide application.

In theater ventilationparticularly, it has been found that the standard of conditions to be maintained within'the theater to produce the greatest comfort to the occupants varies with the external conditions. For exdry bulb temperature is in the neighborhood of 7 0 with a wet bulb temperature of 7 0, it may be found desirableto maintain within the theater a dry bulb temperature of 70 and a relative humidity of however, the external temperature rise to substantially 95 or the wet bulb temperature to 78, the conditions formerly maintained will be found too chilly for comfort. It is standard of conditioning, however, would be found hot and oppressive if still maintained after the external conditions had fallen to tions within the theater taking into account, the external conditions. a v

It is not desirable, however, that this ad justment be continued too far since it is not comfortable to cause the temperature within the theater to fall below a predetermined standard such for example as a dry bulb temperature of 70 and a wet bulb temperature of 58 no matter how low the external teinl trolled by a balancedi. permits the 'perature may fall. Furthermore, there is an upper limitbeyo'nd which it is 'not'desin,

able that the temperature be brought no matter how high the external temperature may be 1 a I atures either ,high or low are Should,

desirable undersuch conditions to raise the their former temperature. It'is an object of this invention to maintain comfort condi.

not met by excessive internal temperatures.

The "HIVGIltlOIl 'accordlngly comprlses a system possessing the features, properties,-

and the relation of'elements which will be exemplified in the system hereinafter de--- scribed and the scope of the application of ,which will-be indicated in the claims. Fig.1 is a diagrammatic view'of an illustrative embodiment of the invention.

Fig. 2 is a diagrammatic view illustrating room having an air inlet at 2 and an outlet ample, 1n the summer months, if the external thereof. Air is admitted to the mixing chamber 10 either from the outside through a c0nduit 13 'or from the outlet 3 through a conduit 14. Air from the outlet 3 may also be admitted to the mixing chamber 12 through a branchconduit 15 and air is taken from the mixing chamber 12, as by a fan 16, to the inlet 2. Suitable dampers 18, 19 and 20 control the 'fresh air through the conduit 13 and the return air through the conduits 14 and 15'. A heater 21 is arranged to add heat to the air within the mixing chamber 10 when the air moistening is otherwise inadequate. ,As this is enerally caused by a low temperature of the resh air, the heater may be placed at the exit of the fresh air conduit if desired. A heater 22 is arranged to add heat to-the air before it is delivered to thelroom, and v, this heater may conveniently be placed wlthin the conduit 15. It will be obvious however,

that the heaters 21 and 22 may be p lacedin any suitable relation to their respective mlxing chambers if desired, An outlet 23, conexit of the foul air. when the dampers 19 and 20 are both closed.-

room at a certain standard of conditions as to temperature or, humidityor both, and for varyin that standard for comfort COIldltions w en the outside conditions-demand. A

the temperature of the spra practical form of accomplishing this result regulating the humidity within the room.

This may be controlled either by regulating water or by controlling the temperature 0 the air which is admitted to the conditioner. A separate means is provided for controlling superheat which may be accomplished either by directly adding heat or by iluting the conditioned air with air having a higher degree of superheat, or both.

In the particular embodiment of the invention herein illustrated, water is carried to the s rays through a conduit 'from a pump 31 belng supplied under the control of a three way valve 32, either froma sump 33 at the bottom of the conditioner or from a refrigerator system 34.. A wet bulb thermostat 35 is arranged to control motors 36, 37,38, and 39, for the'operation respectively of the three way valve 32 and of the dampers 18 and 19 and of a valve 40 for controlling the admis- Thethermostat 41, also responsive to the condition of the air of the room operates motors 42 and 43, controlling respectively the supply of the steam to the coil 22 and the damper 20, in a manner such that if the temperature within the inclosure becomes too low, the damper 20 is first operated to in crease the quantity of return air which is admitted to the mixing chamber 12, thereby de-.

of conditionedair which e washer.- If this be insteam creasingthe quantit is dr'awn through t suflicient to maintain the temperature, is admitted to the heater 22.

A system such as above described w1ll maintaimwithin the enclosure a standard of conditions determined. by thesetting of the thermostats 35 and 41: In order to vary this standard to comfort'cbndition, vided a thermostat responsive to outside conditions, 'which thermostat is arranged to alter the efl'ect of the thermostats 41 and 35 whenever the external temperature rlses above a certain value. .The diagram of Figure manner of doing this, comprising as illustrated an expanslon chamher 51 responsive to the external air, and having aflexible wall 52 carrying a-needle valve 2 is illustrative of a A 53 for controlling the flow of compressed air from a compressed air source 54 to a donduit sion of steam to the heater 21. The opera-' there is pro- The thermostat 50;

55. The arrangementbeing such that as the external temperature rises, compressed air is admitted to the conduit 55: This admission, 7

however, is a gradual one.

The relative position of the needle tothe valve seat, may be so arran ed that a rise in temperature will not actually start to open the valve until a predetermined temperature is reached. During the further'rise in temw perature, as the valve is gradually opened, the

flow. of air is commenced, building u pressure within the system until the thrott ing effect ceases with the valve open. Thereafter a further rise in temperature meets with no further pressure increase, and hence no fur-' ther effect upon the thermostats. In this manner'the operation may be arranged to cause the thermostat 50 to become effective in" itsregulation only between certain" specified minimum and maximum temperatures.

The wet bulb thermostat 35 is preferably of the air moistening pending application Serial #235,357, filed type illustrated in my 00- 1 November 23rd, 1927, in which a small body of water is brought to the wet bulb temperature by causing a portion of the air to be measured to pass through the spray. The Wet =bulb tempera-ture itself is determined by measuring the temperature of the water. A R thermostat device within the water of the instrument 35 may actuate an operating coil 56 of the control valve 56 tooperate a solenoid armature 57 to move the needle valve 58, to

admit compressed air from a compressed air supply'59, to the motors 36, 37, 38 and39.

The dry bulb thermostat 41, comprises an .expansion chamber 60 adapted to respond to the temperature of the return air and having a flexible wall 61, connecting with-a lever 62, to control the needle valve 63 to admit c'ompressedair from-the compressed air supply 64 to the motors 42, and. 43. Each ofthe thermostats35 and 41 is providedwith a chamber 65 and 66, each of which is in communication with the conduit 55 and within this system there is provided a leak 67, whereby the pressure within these chambers ,varies in accordance with the throttling of the compressed air of the needle valve 53. x The chamber 65 is connected with the needle valve 58 to oppose the movement of the armature 57 in response to the solenoid 56.

When the high outer temperature admits compressed air to the chamber 65, the needle valve 58 will be opened with greater difliculty by the wet bulb thermostat and hence a higher wet bulb temperature will be maintained within the room. 1

Similarly the chamber 66'is arranged to oppose the action of the chamber 60 to cause the needle 63 to be operat'edwith greater dilficulty and hence to maintain a higher dry bulb temperature-within the room. By controlling the size of the'chambers, 65 and 66, and the leverage employed, the degree of-rise I at will.

. be exemplified in the construction hereinafter Byithe above construction it will be evident that during cold weather and untilthe outside temperature rises above the critical value, the thermostats 41 and 35 will operate while the needle valve 53 remains seated, thus maintaining the standard of dry and wet. bulb temperature within the room for which the ther mostats are set. 'As soon however, as the critical temperature is reached and the needle valve 53 starts to open, pressure starts to build up within the chambers and 66 which, opposing the operation of the thermostats them: selves, in effect, sets them to a higher value and causes that higher value to be maintained within the room.

The invention accordingly comprises the features of construction combinations of elements, and arrangement of parts, which will .set forth andthescope of the application of which will be indicated in the claims.

It is also to be understood that the following claims are intended to cover all of the general and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of lan uage, might be said to fall therebetween.

. aving described my invention, What I claim as new and desire tosecure by Letters Patent, is

1. In a ventilating system, in combination, means for admitting external air to said room, means for maintaining a standard of humidity within a room, means res onsive to external temperature conditions or varying saidstandard, and means for imposing a minimum and maximum limit upon such variation.

2. In a ventilating system, in combination, means for circulating air into an enclosure, means for varying the condition of theenter- .i'ng air in response to the condition of the air of the enclosure to maintain a standard ofcondition wit-hinthe enclosure, means for admitting outside air to said enclosure,- and means responsive to the dry bulb temperature of'such outside air to vary said standard, and for varying the standard responsive to temperature changes, by maintaining a desired difl'erentialbetween indoor and outdoor temperatures within predetermined limits.

3. In a ventilating system, in combination, means forcirculating air into an enclosure, means for conditioning said-air, a wet bulb thermostat responsive to the wet bulb temperature of the air in the,enclosure' to vary said conditioning to maintain a standard of humidity ,within the room, and means respo'nsive to outside dry bulb terhperatureto vary the operation of said thermostat wit-hinga defined range.

Y 4. In aventilating system in combination, 7 means for ClIOlllfltlIlg-flll 1nto an enclosure,

means for conditioning'said air, a wet bulb thermostat responsive to the wet bulb temperature of the air in the enclosure to vary 1 said conditioningto maintain a standard temperature, and means responsive to exterv nal conditions tovary the standard of dry bulb temperature.

6. In a ventilating system in combination, means for circulating air into an enclosure, means for conditioning said air, a Wet bulb thermostat responsive to the wet bulb temperature of the air in the enclosure to vary said conditioning to maintain a standard of humidity within the'room, and means responsive to the dry bulb temperature within the encl0sure to maintain a standard of dry bulb temperature, and means responsive to-out-- si'de temperature to varysaid standards of humidity and temperature, and means to limit said variation within a predetermined range of outside dry bulb temperatures.

7, A ventilating system comprising, in combination, a conditioning apparatus ineluding a conditioner, a thermostat'responsive to roomtemperature for regulating thetemperature Within the conditioner, and mas- ,tcr control means responsive to outside temperature for causing said thermostat to maintain a difi'erent-ial between indoor and outdoor temperatures, commencing at a predetermin'ed'low point and effective Within a pre determined highpoint. v

8. In a device'of the character described, in combination, a conditioner, means for conducting conditioned air to an enclosure, means for supplying to the intake ofthe conditioner, both fresh and return air, a

thermostat responsive to the wet bulb tem-' return air -to the discharge of" said condi ti oner, means for supply-in return and fresh an to the intake of said con itioner, a thermo stat responsive to humidity within the enclosure for varying the proportions of fresh and return air fed to said conditioner, a thermostat responsive to temperature within the-enclosure for varying the amount of return air to the conditioner discharge, and a master control responsive to outside'dry bulb 'tem-' perature conditions for varying the efl'ect of said thermostats to cause a differential to be maintained between outdoor and indoor humidity conditions.

10. In a device of the character described in combination, a conditioner, means for conducting air from the discharge of said conditioner to an enclosure, means for supplying return air and heat to the discharge of sai conditioner, means for supplying return and fresh air to the intake of saidconditioner, a thermostat responsive to humidity within the enclosure for varying the proportions of fresh and return air fed to saidconditioner, a thermostat responsive to temperature within the enclosure for varying the amount of-return air to the conditioner discharge, and a thermostat responsive to outside dry bulb tem: .perature conditions for varying the efit'ect of both of said thermostats.

11. The method of ventilation which comprises s'upplying air to an enclosure, conditioning said air, controlling the dewpoint of the conditioned air to maintain a standard dewpoint in the air of the room, controlling the temperature of the air after conditioning to maintain a standard of temperature in the enclosure, and varying one of said standards to correspond difierentially with changes in outdoor temperature within prescribed limits.

12. The method'of ventilation which comprises supplying air to an enclosure, conditioning said air, controlling the dewpoint of the conditioned air to maintain a standard dewpoint in the air of the room, and 'control- I ling the temperature of the air'after conditioning by diluting the conditioned air with varying quantities of return air to maintain a standard of temperature in the enclosure,- and varying one of said standards by the outside temperature for maintainin a difierential between said standard and t e outside temperature. a p

13. In a ventilating system in combination,

- a conditioner, means for sup lying conditioned air to an enclosure, a t ermostat' for maintaining the humidity and a second thermostat for maintaining the temperature, both 1,751,806 a I 'w\ inlet, a 'duct connectin said unit to the en closure outlet, a valvewlthin said duct, means responsive to the wet bulb conditions'of the air within said enclosure and acting to operate said valve, and a controlling member for said last named means and acting in response to' dry bulb temperature conditions ofthe outside air to vary the action of said valve operating means; a 15. An @lltCOlldltlOIllllg system including, 1n combination, an enclosure member provided with an inlet and outlet, an air conditioning unit, a duct extending therefrom a duct extending from the discharge end of said ,unit and connecting vthe same, with the inletopeningof said enclosure, a further duct extending from the outlet opening of said enclosure to the intake end'of said unit a by- .ify the action of said valve operating means.

In testimony whereof I aflix my signature.

L.- FLEISHER.

said thermostats being responsive to room conditions and a thermostat responsive to outside temperatures for varying the efiect of both said first mentioned thermostats to main-' tain a diflerential between indoor and outdoor temperature.

14. In a ventilating and conditioning system, in combination, an enclosure having an inlet and outlet, an air conditioning unit,

means connecting said unit to the enclosure Q and in communication with the outside air, 

